Abstract
Due to outstanding room temperature electron mobility, the wide-gap perovskite semiconductor BaSnO3 is of high current interest. Although n doping with Sb and O vacancies has been reported, most work has focused solely on La doping. Here we report bulk single crystals of Ba1-xRxSnO3-δ with R=La,Pr, and Nd, as well as unintentionally doped BaSnO3-δ, thus exploring new rare earth (magnetic) dopants in addition to O vacancy doping. Consistent with recent results on epitaxial films, O vacancies are shown capable of generating mid-1019cm-3 Hall electron densities, with single crystal mobilities ∼100-150cm2V-1s-1. Despite apparent solubility limits below ∼0.5at.%, Pr and Nd are also shown to be effective n dopants, yielding Hall electron densities >1×1020cm-3, and ambient and low temperature mobilities up to 175 and 430cm2V-1s-1, respectively. In contrast to the La-doped case, clear paramagnetism occurs with Pr and Nd doping, allowing for direct estimates of dopant concentrations for quantitative comparison with Hall densities. We show that dopant and Hall densities can be approximately reconciled, but only after accounting for O vacancy doping. Specific heat measurements were also performed, confirming the BaSnO3 Debye temperature, and revealing electronic contributions roughly consistent with reported effective masses. Interestingly, and likely related to crystalline electric field effects, Pr-doped BaSnO3 exhibits large deviations from simple Curie-Weiss susceptibility, and a pronounced Schottky anomaly, which we analyze in detail. These results provide significant insight into doping in BaSnO3, establishing new rare earth magnetic dopants, clarifying the role of O vacancies, and determining dopant concentrations and solubility limits.
| Original language | English (US) |
|---|---|
| Article number | 084601 |
| Journal | Physical Review Materials |
| Volume | 2 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 3 2018 |
Bibliographical note
Funding Information:Work at the University of Minnesota was funded by the Department of Energy through the University of Minnesota Center for Quantum Materials, under DE-FG02-06ER46275 and DE-SC-0016371. E.M. acknowledges financial support from the Natural Sciences and Engineering Research Council of Canada. Crystal growth, magnetometry, and x-ray diffraction work at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. This work is based upon research conducted at the Cornell High Energy Synchotron Source (CHESS), which is supported by the National Science Foundation under award DMR-1332208.
Funding Information:
Work at the University of Minnesota was funded by the Department of Energy through the University of Minnesota Center for Quantum Materials, under DE-FG02-06ER46275 and DE-SC-0016371. E.M. acknowledges financial support from the Natural Sciences and Engineering Research Council of Canada. Crystal growth, magnetometry, and x-ray diffraction work at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. This work is based upon research conducted at the Cornell High Energy Synchotron Source (CHESS), which is supported by the National Science Foundation under award DMR-1332208.
Publisher Copyright:
© 2018 American Physical Society.